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Day 2— .NET Performance Series
Which Is Faster in C#: Record, Class, or Struct? Deep Dive on Memory and Equality
Struggling to choose between Record, Class, or Struct in C#? This guide breaks down memory, equality, and performance to help you decide.
5 min readApr 15, 2025
Access the complete performance series here
I still remember the moment this all began. A junior dev had walked up to my desk with a puzzled look and asked,
“Why did you switch my class to a record? And why did you create a struct for the coordinates?”
I turned my chair around, smiled, and said, “Grab your coffee, this is going to be a deep dive.” What followed was an hour-long conversation that took us through the guts of C# — record vs. class vs. struct — and the fine print most developers overlook: memory footprint and equality comparisons.
